GND INCIDENT. ATX ACFT COLLIDES WITH OBSTRUCTION POLE WHILE TAXIING AT NON TWR ARPT.

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TAXIED MU-2 ACFT INTO LIGHT POST ON N SIDE OF ARPT TXWY. ALTHOUGH ONLY COSMETIC DAMAGE WAS DONE TO THE AIRPLANE; THE LIGHT POST SUFFERED SEVERE DAMAGE AND TUMBLED TO THE GND. I; THE PIC AND THE ONLY PERSON ABOARD; OBTAINED A STANDARD BRIEFING FROM FLT SVC (DAYTON) PRIOR TO DEPARTING I23 (FAYETTE COUNTY) FOR YOUNGSTOWN EXECUTIVE (06G). NO NOTAMS (L) OR (D) OR (FDC) HAD BEEN ISSUED FOR 06G; BUT AS I FOUND OUT AFTER THE INCIDENT; THE ARPT FACILITY DIRECTORY RPTED THE TXWY CLOSED. THIS WAS MY FIRST VISIT EVER TO 06G AND SO I LOOKED OVER THE ARPT IN BOTH MY COMMERCIAL AND GOV APCH PLATE; BUT NEGLECTED TO CHK THE AFD. ALL INFO I OBTAINED SO FAR LED ME TO BELIEVE THIS WAS A ROUTINE ARPT. NOT SO; I FOUND WHEN I ARRIVED. I NEARLY ABORTED MY APCH BECAUSE THIS ARPT HAD NOTHING TO INDICATE IT WAS AN ARPT AT ALL. ON THE CONTRARY; RWY MARKINGS WERE BARELY VISIBLE IN THE BRIGHT SUN OF THE DAY. BASEBALL STADIUM LIGHT POSTS ALIGNED THE NORTHERN PERIMETER OF THE RWY AND RUBBER BURNOUT MARKS WERE THICK AT THE THRESHOLD. THIS PLACE LOOKED MORE LIKE A DRAG STRIP THAN AN ARPT. WHEN I LANDED; I FOUND THE 'SO CALLED 60 FT WIDE RWY' WITH 20 FT OF GRUMBLING; GROWN OVER; ASPHALT ON EITHER SIDE. AS I ROLLED OUT ON RWY 11 NO MARKINGS WERE VISIBLE EXCEPT A BEAUTIFUL TXWY LEAD-OFF LINE. SINCE I DID NOT WANT TO RISK TURNING AROUND I FOLLOWED THAT LEAD OFF-LINE ONTO WHAT LOOKED LIKE A GOOD TXWY. THIS TXWY NARROWED SUDDENLY AND I FOUND MYSELF RUNNING INTO A BASEBALL STADIUM LIGHT POST. THERE WAS NO MARKING TO INDICATE THIS TXWY WAS CLOSED! THIS ARPT IS A HAZARD AND SHOULD BE CLOSED UNTIL IT IS CLEANED UP.